CreateFile returning ERROR_ACCESS_DENIED for volumes

I am trying to open a volume using CreateFile. Code i am using is this.

CreateFile( TEXT("\\\\.\\c:"), 
    GENERIC_READ | GENERIC_WRITE, 
    FILE_SHARE_READ | FILE_SHARE_WRITE,
    NULL,
    OPEN_EXISTING,
    0,
    NULL);

I took this sample from this link. Walk through NTFS journal windows. It was failing for my code earlier. So i tried above snippet from above link. This too failed with same error. I read about it a lot but could not get any solution. So can someone please guide on how to get a volume handle correctly.